JP2013132237A - Plant culture pot and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide plant culture pots and a method for manufacturing the plant culture pots that can be prevented from the mutual close contact of bottom wall parts with simple configuration and can be easily taken out when stacked for use.SOLUTION: Ribs 4 rise at the same height as the depth of each recess 3b from the bottoms of the recesses 3b, 3b adjacently arranged on both sides. When a plurality (two in the figure) of seedling raising pots 1 are vertically superimposed, the tip of the rib 4 rising from the recess 3b of a bottom wall part outer surface 3a of a seedling raising pot 1 located on the upper side abuts on the upper face of a protrusion 3d of a bottom wall part inner surface 3c of the seedling raising pot 1 located on the lower side, and a space 5 equivalent to the height of the rib 4 is formed between the bottom wall part 3 of the upper seedling raising pot 1 and the bottom wall part 3 of the lower seedling raising pot 1. Since the mutual close contact of the bottom wall parts 3, 3 of the upper and lower pots 1, 1 can be prevented by the ribs 4, the pots can be easily taken out one by one from the upper part of a stacked group.

Description

  The present invention relates to a plant culture pot and a method for producing the same.

  Plant culture pots are also commonly referred to as seedling pots. For example, they are widely used for sowing vegetables and flowers, raising seedlings, and the like. It is common to take them out one by one. Since soft synthetic resin materials such as polyethylene and polypropylene are formed in a thin-walled seedling pot by blow molding, two or more pieces may be taken out at the time of taking out, resulting in a decrease in work efficiency. Therefore, conventionally, in order to improve the separation of the soft and thin pot, it has been proposed to provide a protrusion on the bottom surface portion and to make the circumferential phase of the protrusion different for each pot (see Patent Document 1). ).

  By making the phases of the protrusions different as in Patent Document 1, it is possible to prevent the bottom portions (or peripheral surface portions) of the pots from sticking to each other, and the pots can be easily taken out one by one. However, for example, when several tens, hundreds or more pots are stacked and used, as in the pot gripper shown in Patent Document 2, a plurality of stacks of seedling pots are arranged vertically and horizontally, and seedling pots are arranged from each stack. When one piece is taken out at a time, a large number of blow molds in which the phases of the protrusions are slightly different from each other so that pots in the same phase do not overlap each other are required, which may increase the manufacturing cost. . In addition, no matter how much the number of phases is increased, the possibility that the pots with the same phase overlap each other cannot be reduced to zero. To drop.

JP-A-8-214705 JP 2009-89654 A

  An object of the present invention is to provide a plant culture pot and a method for producing the same that can prevent the bottom wall portions from sticking to each other with a simple configuration and can be easily taken out even when stacked.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, the plant culture pot of the present invention comprises:
Made of a synthetic resin that is thinly formed by blow molding, has a peripheral wall portion that expands upward and opens, and a bottom wall portion that closes its lower end side, and a plurality of pieces can be stacked vertically. A plant culture pot,
On the outer surface of the bottom wall portion, two adjacent concave portions that are convex inward are formed, and a partition wall-shaped intermediate having a height in the depth direction of the concave portion between the two concave portions. Part exists,
On the other hand, on the inner surface of the bottom wall portion, one convex portion corresponding to the two concave portions and integrated is formed,
The intermediate portion existing between the two concave portions is formed on the inner surface of the bottom wall portion located below the concave portion of the outer surface of the upper bottom wall portion when a plurality of the pots are overlapped. The convex portion is prevented from fitting, and a space can be formed between the upper bottom wall portion and the lower bottom wall portion.

Or in order to solve the said subject, the plant culture pot of this invention is the following.
Made of a synthetic resin that is thinly formed by blow molding, has a peripheral wall portion that expands upward and opens, and a bottom wall portion that closes its lower end side, and a plurality of pieces can be stacked vertically. A plant culture pot,
On the outer surface of the bottom wall portion, a concave portion that is convex inward is formed, and there is a columnar intermediate portion having a height in the depth direction of the concave portion in the concave portion,
On the other hand, a convex portion corresponding to the concave portion and not corresponding to the intermediate portion is formed on the inner surface of the bottom wall portion,
The intermediate portion present in the concave portion is the convex portion on the inner surface of the bottom wall portion located below the concave portion on the outer surface of the bottom wall portion located on the upper side when a plurality of the pots are overlapped. Is prevented from being fitted, and a space can be formed between the upper bottom wall portion and the lower bottom wall portion.

  Simply leave a partition wall-shaped intermediate portion between two adjacent concave portions formed on the outer surface of the bottom wall portion, or leave a columnar intermediate portion in the concave portion formed on the outer surface of the bottom wall portion. Depending on the configuration, even if the concave portion of the upper pot and the convex portion of the lower pot are in the same phase in the circumferential direction, a space is formed between the bottom wall portions of the plant culture pots adjacent in the vertical direction. In this way, it is possible to prevent the bottom wall portions of the upper and lower pots from coming into close contact with each other, and they can be easily taken out one by one even when stacked. In addition, by leaving a part of the parison connecting portion at the time of blow molding as a parison remaining portion, a partition wall-shaped intermediate portion or a columnar intermediate portion can be formed. There may be one or more (two or more) remaining parisons.

  The parison remaining portion, which is an intermediate portion of the partition wall shape, is formed in a plate shape, and the recesses are formed on both sides of the thickness of the outer surface of the bottom wall portion with the parison remaining portion interposed therebetween.

  Thus, even if it is a case where many plant culture pots are piled up and used by forming a crevice on both sides of a plate-like parison remainder, a parison remainder is a reinforcement member of a crevice (namely, bottom wall part). Thus, a predetermined space can be formed between the bottom wall portions.

  The parison remaining portion and the concave portion are formed at fixed positions in the circumferential direction and the radial direction with respect to the blow center at the time of blow molding on the outer surface of the bottom wall portion.

  As described above, even if the parison remaining portion and the concave portion are formed at fixed positions in the circumferential direction and the radial direction, a space is formed between the bottom wall portions of the plant culture pots adjacent in the vertical direction by the parison remaining portion. In other words, since the space is formed by the parison remaining portion, the parison remaining portion and the concave portion can be formed at constant positions in the circumferential direction and the radial direction, and a plurality of types of plant culture pots in which the phases of the protrusions are shifted as in the conventional case (And multiple types of blow molds therefor) need not be prepared.

  For example, when the parison remaining part is formed including the parting line at the time of blow molding (specifically on the parting line) and the concave parts are formed on both sides of the parting line, the concave parts are formed by the blow molding die. It can be formed easily.

Moreover, in order to solve the said subject, the manufacturing method of the plant culture pot of this invention,
Made of a synthetic resin that is thinly formed by blow molding, has a peripheral wall portion that expands upward and opens, and a bottom wall portion that closes its lower end side, and a plurality of pieces can be stacked vertically. A method for producing a plant culture pot,
The mold surface for molding the bottom wall of the pot for blow molding has two convex portions adjacent to each other, and the two convex shapes are transferred to the resin at the time of blow molding, and between the two convex portions By filling the gap with resin, two concave portions are formed on the outer surface of the bottom wall portion of the pot with a partition wall-shaped intermediate portion in between,
On the other hand, an integrated convex portion is formed on the inner surface of the bottom wall portion of the pot by corresponding to the two concave portions and filling all or part of the gap between the two convex portions with resin. It is characterized by being.

Or in order to solve the said subject, the manufacturing method of the plant culture pot of this invention,
Made of a synthetic resin that is thinly formed by blow molding, has a peripheral wall portion that expands upward and opens, and a bottom wall portion that closes its lower end side, and a plurality of pieces can be stacked vertically. A method for producing a plant culture pot,
The mold surface for molding the bottom wall portion of the pot for blow molding has a convex portion and a hole-shaped concave portion formed in the convex portion, and the convex shape is transferred to the resin at the time of blow molding By filling the concave portion with resin, a concave portion that protrudes inward and a columnar intermediate portion located in the concave portion are formed on the outer surface of the bottom wall portion of the pot,
On the other hand, the inner surface of the bottom wall portion of the pot corresponds to the concave portion formed with a convex portion corresponding to the convex portion of the mold surface and not corresponding to the concave portion of the mold surface, and corresponds to the intermediate portion. The convex part which does not carry out is formed.

  The mold surface for molding the bottom wall portion is provided with two convex portions adjacent to each other, or the mold surface for molding the bottom wall portion is provided with a convex portion and a concave portion formed in the convex portion. Even if the concave portion of the upper pot and the convex portion of the lower pot are in the same phase in the circumferential direction by a simple process of filling the gaps or concave portions between the portions with resin, the bottom wall portion of the plant culture pot that is adjacent in the vertical direction A space is formed between them. In addition, a parison remainder and a recessed part can be formed in the outer surface of the bottom wall part (of a blow molding) by leaving a part of parison connection part as a parison remainder. Thus, since a parison remainder and a recessed part can be formed in the outer surface of a bottom wall part, without passing through a complicated process, the plant culture pot used by stacking many can be manufactured efficiently and cheaply.

  For example, in the blow molding process, when the parison connection portion is arranged including the parting line (specifically, on the parting line), the convex portions are respectively formed on both sides of the parting line in the blow molding die. Can be easily done.

The perspective view which looked at one Example of the seedling raising pot concerning this invention from diagonally downward. The bottom view of the seedling pot of FIG. The top view of the seedling pot of FIG. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3 in a stacked state. VV sectional drawing of FIG. 3 in a stacked state. The elements on larger scale of FIG. The top view which shows typically the manufacturing process of the seedling pot of FIG. Front sectional drawing of FIG. FIG. 8 is a plan view schematically showing the manufacturing process following FIG. 7. FIG. 10 is a front sectional view of FIG. 9. The perspective view which looked at the other Example of the seedling pot concerning this invention from diagonally downward. The bottom view of the seedling pot of FIG. The top view of the seedling pot of FIG. The XIV-XIV cross-sectional enlarged view of FIG. 13 in a stacked state. The top view which shows typically the manufacturing process of the seedling pot of FIG. The top view which shows typically the manufacturing process following FIG.

Example 1
Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. A seedling pot 1 (plant culture pot) shown in FIG. 1 is used for sowing vegetables, flowers, and the like, and is made of a soft synthetic resin such as polyethylene, and is formed into a thin wall by blow molding described later. Yes. This seedling pot 1 has a peripheral wall portion 2 that expands upward and has an opening 2a and a bottom wall portion 3 that closes its lower end side, and a plurality of them are stacked in the vertical direction, and taken out one by one from above. (See FIGS. 4 and 5).

  A drain port 7 is formed through the center of the bottom wall portion 3 (including the blow center), and a predetermined angular interval (for example, 90 °) in the circumferential direction around the drain port 7 is formed on the outer surface 3a of the bottom wall portion 3. (For example, four) protrusions 6 bulge out at equal intervals. These protrusions 6 are first grounded on the ground or the like to support the seedling pot 1 and the contents, and are provided in different directions on the outer surface 3a of the bottom wall portion 3 and thus function as anti-slip.

  As shown in FIGS. 2 and 3, a rib 4 (parison remaining portion; intermediate portion) formed at the time of blow molding and a recess 3 b are arranged on the outer surface 3 a of the bottom wall portion 3 of the seedling pot 1. The rib 4 is provided at one place or a plurality of places (two places symmetrical with respect to the blow center in the drawing) on the parting line PL at the time of blow molding, and is formed in a plate shape along the parting line PL.

  Since the recesses 3b are formed on both sides of the thickness of the rib 4 with the rib 4 interposed therebetween, a total of four recesses 3b are formed on the outer surface 3a of the bottom wall 3. At the time of blow molding, a concave portion 3b having the same shape as the mold convex portion 10b is formed on the outer surface 3a of the bottom wall portion 3 by the mold convex portion 10b having a rectangular cross section (square shape or rectangular shape) formed in the blow molding die 10. A rectangular convex portion 3d is formed on the inner surface 3c, which is transferred and formed on the inner surface 3c (see FIG. 10). That is, the outer surface 3a of the bottom wall portion 3 is formed with two adjacent concave portions 3b and 3b that protrude inward, and the depth direction of the concave portion 3b is between the two concave portions 3b and 3b. There are partition wall-like ribs 4 having a height of 1 mm. On the other hand, on the inner surface 3c of the bottom wall portion 3, a single convex portion 3d corresponding to and integrated with the two concave portions 3b and 3b is formed (see FIG. 6).

  As shown in FIGS. 4 to 6, the rib 4 is erected at the same height as the depth of each recess 3 b from the bottom of the recesses 3 b, 3 b disposed adjacent to both sides. Therefore, when a plurality of seedling pots 1 (two in FIG. 6) are stacked in the vertical direction, the tips of the ribs 4 standing from the recesses 3b of the bottom wall portion outer surface 3a of the seedling pot 1 positioned on the upper side are The rib 4 is in contact with the upper surface of the convex portion 3d of the bottom wall portion inner surface 3c of the seedling pot 1 positioned on the lower side and between the bottom wall portion 3 of the upper seedling pot 1 and the bottom wall portion 3 of the lower seedling pot 1 A space 5 corresponding to the height of is formed.

  In other words, the rib 4 prevents the convex portion 3d of the bottom wall portion inner surface 3c of the lower seedling pot 1 from fitting into the concave portion 3b of the bottom wall portion outer surface 3a of the upper seedling pot 1 so that the upper concave portion A space 5 equivalent to the height of the rib 4 is formed between 3b and the lower convex portion 3d. As described above, the ribs 4 can prevent the bottom wall portions 3 and 3 of the upper and lower pots 1 and 1 from sticking to each other, so that they can be easily taken out one by one from above the stacked group.

  Next, the manufacturing method of the seedling pot 1 by blow molding will be described with reference to FIGS. In order to realize the manufacturing method described below, for example, a double-head blow molding machine or a rotary blow molding machine can be used.

<Parison formation process> (FIGS. 7 and 8)
A synthetic resin (for example, polyethylene) plasticized by heating is extruded as a tube-shaped parison PR from a die 11 (die) of an extruder (not shown). The parison PR is extruded so that the blow molded body BB after blow molding has a shape (see FIG. 10) in which the openings 2a (see FIG. 1) of the two seedling pots 1 are connected to each other.

<Blow molding process> (FIGS. 9 and 10)
The pair of blow molds 10 and 10 are closed, the parison PR is sandwiched, and air is blown from the nozzle 12 disposed at the center of the die 11. The parison PR is inflated with the blown air and pressed against the inner surfaces of the blow molds 10, 10, and a blow molded body BB corresponding to two seedling pots is made from the pair of blow molds 10, 10.

  Due to the nozzle 12 and the semicircular cutouts 10a, 10a (see FIG. 7) of the pair of blow molds 10, 10, a cylindrical tubular connecting portion PC1 (parison connection) is formed on the outer surface 3a of the upper bottom wall portion 3. Part) is formed (see FIG. 10). Further, by leaking a part of the softened resin from the gap between the pair of blow molds 10, 10, the outer surface 3a of the upper bottom wall portion 3 sandwiches the cylindrical connection portion PC1 (blow center). Plate-like connecting portions PC2 (parison connecting portions) are formed on both sides. In addition, on the outer surface 3a side of the bottom wall portion 3 on the lower side, the parison connecting portions (cylindrical connecting portion PC1 and plate connecting portion PC2) are compressed by the blow molds 10 and 10, and the internal space of the cylindrical connecting portion PC1. Is closed.

  On the other hand, the pair of blow molds 10 and 10 are formed with mold convex portions 10b (convex portions) having a rectangular cross section for forming the concave portions 3b on the outer surface 3a of the bottom wall portion 3 (FIGS. 7 and 7). 8). A total of eight mold convex portions 10b (four mold convex portions 10b per pot) are formed on the blow molded body BB for two seedling pots. At the time of blow molding, a concave portion 3b having the same shape as the mold convex portion 10b is formed on the outer surface 3a of the bottom wall portion 3 and a rectangular convex portion 3d is formed on the inner surface 3c. That is, the convex shape of the two mold convex portions 10b, 10b is transferred to the resin at the time of blow molding, and all or part of the gap between the two mold convex portions 10b, 10b is filled with the resin, Two concave portions 3b and 3b are formed on the outer surface 3a of the bottom wall portion of the pot with a partition wall-like rib 4 interposed therebetween. On the other hand, the bottom wall portion inner surface 3c of the pot corresponds to the two recessed portions 3b and 3b, and the gap between the two mold protruding portions 10b and 10b is filled with resin, thereby integrating one protruding portion. 3d is formed.

  When the pair of blow molds 10 and 10 are opened after blow molding and the cooled and solidified blow molded body BB is taken out, the cylindrical connection portion PC1 and the plate-like shape are respectively formed on the outer surfaces 3a of the upper and lower bottom wall portions 3 as described above. A connecting part PC2 is formed. Then, by alternately repeating the parison forming process and the blow molding process described above, a new parison PR is extruded from the die 11 and then blow-molded continuously to the blow-molded body BB after the blow molding. Subsequent blow molding BB is formed. As a result, the bottom wall portions 3 of the adjacent blow-molded bodies BB are manufactured one after another in a state of being connected by the parison connecting portions (the cylindrical connecting portion PC1 and the plate-like connecting portion PC2).

  The inner peripheral surface of the concave portion 3b (the outer peripheral surface of the mold convex portion 10b) is formed into a divergent inclined surface 3b1 (inclined surface 10b1) that expands outward as it goes outward from the cavity CA (FIG. 1, FIG. 1). (See FIGS. 6 and 10). By forming the outer peripheral surface of the mold convex portion 10b on the inclined surface 10b1 (and the inner peripheral surface of the concave portion 3b on the inclined surface 3b1), when the blow molds 10 and 10 are opened, the pot 1 ( The bottom wall portion 3 (particularly the concave portion 3b) of the blow molded body BB) can be elastically deformed, and the mold can be opened with good releasability without causing an undercut.

  The rib 4 has the same thickness on the bottom side and the opening side of the recess 3b (see FIG. 6), but the opening side is larger than the bottom side of the recess 3b, or the bottom side is larger than the opening side. Or you may. Note that a thin groove 3e may be formed along the parting line PL on the convex portion 3d of the bottom wall portion inner surface 3c (see FIG. 6). This is because the mold clamping force of the blow molds 10 and 10 cannot be formed at the joint of the molds 10 and 10 and is included in the integrated single convex portion 3d.

  The connecting portion between the parison connecting portions PC1, PC2 and the bottom wall portion 3 of the blow molded body BB is formed thin. Therefore, if an operator lightly twists the parison connecting portions PC1 and PC2, the ribs 4 formed between the two concave portions 3b and 3b of the bottom wall portion outer surface 3a can be easily separated. In the blow-molded body BB, the joining portion of the two seedling pots 1 is also extremely thin or perforated, so that it can be easily separated manually.

  Thus, in the blow molding process, the recess 3b is formed adjacent to the plate-like connection part PC2 that connects the outer surfaces 3a of the bottom wall part 3, and in the parison connection part removal process, a part of the plate-like connection part PC2 is formed. By leaving as the rib 4, the rib 4 and the recess 3 b are formed on the outer surface 3 a of the bottom wall portion 3. That is, since the rib 4 and the recessed part 3b can be formed in the outer surface 3a of the bottom wall part 3 without adding another process, the seedling pot 1 used by stacking many can be manufactured efficiently and inexpensively. Moreover, the concave portion 3b (the convex portion 3d on the inner surface 3c) can be easily formed on the outer surface 3a of the bottom wall portion 3 simply by forming the mold convex portion 10b on the blow mold 10.

(Example 2)
Also on the outer surface 3a of the bottom wall 3 of the seedling pot 1 (plant culture pot) shown in FIG. 11, a protrusion 8 (parison remaining portion; intermediate portion) and a recess 3b formed during blow molding are arranged. As shown in FIGS. 12 and 13, the recess 3b is provided at one or a plurality of locations (two locations symmetrical to the blow center in the figure) on the parting line PL at the time of blow molding. It is formed in a shape (elliptical shape in the figure) that is long in the direction intersecting (orthogonal in the figure). The protrusion 8 is provided on the parting line PL at the time of blow molding, and is formed to protrude in a columnar shape (for example, a columnar shape) from the bottom of the recess 3b. That is, the outer surface 3a of the bottom wall portion 3 is formed with a concave portion 3b that protrudes inward, and there is a columnar protrusion portion 8 having a height in the depth direction of the concave portion 3b in the concave portion 3b. To do. On the other hand, a convex portion 3d corresponding to the concave portion 3b and not corresponding to the protruding portion 8 is formed on the inner surface 3c of the bottom wall portion 3 (see FIG. 14). The cross-sectional shape of the protrusion 8 may be an elliptical shape, a polygonal shape, or the like. The shape of the recess 3b may be a rectangular shape or the like other than the elliptical shape.

  Therefore, as shown in FIG. 14, when a plurality (two in the figure) of the seedling pots 1 are stacked in the vertical direction, the seedling pot 1 stands upright from the recess 3b on the outer surface 3a of the bottom wall part of the seedling pot 1 positioned on the upper side. The tip of the protrusion 8 abuts on the upper surface of the convex portion 3d of the bottom wall portion inner surface 3c of the seedling pot 1 located on the lower side, and the bottom wall portion 3 of the upper seedling pot 1 and the bottom wall portion of the lower seedling pot 1 3, a space 5 corresponding to the height of the protrusion 8 is formed.

  As shown in FIGS. 15 and 16, the pair of blow molds 10 and 10 are formed with a half of the mold convex portion 10 b (convex portion) for forming the concave portion 3 b on the outer surface 3 a of the bottom wall portion 3. ing. Therefore, when the molds 10 and 10 are closed as shown in FIG. 16, the mold convex portions 10b and 10b (elliptical shape) corresponding to the concave portions 3b having an elliptical cross section are obtained. Further, the mold convex portion 10b of the blow molds 10 and 10 is formed with a mold concave portion 10c (concave portion) for forming the protruding portion 8 in half (ie, in a semicircular cross section). Therefore, when the molds 10 and 10 are closed as shown in FIG. 16, hole-shaped mold recesses 10c and 10c (circular holes) corresponding to the shape (circular cross-sectional shape) and height of the protrusion 8 are obtained.

  That is, as shown in FIG. 14, the shape of the convex portions of the mold convex portions 10b, 10b is transferred to the resin at the time of blow molding, and the hole-shaped mold concave portions 10c, 10c are filled with the resin, so that the bottom of the pot On the wall outer surface 3a, there are formed a recess 3b that protrudes inward, and a columnar protrusion 8 that is located in the recess 3b. On the other hand, a convex portion 3d corresponding to the mold convex portion 10b (recessed portion 3b) and not corresponding to the mold concave portion 10c (projecting portion 8) is formed on the inner surface 3c of the bottom wall portion of the pot.

  The inner peripheral surface of the concave portion 3b (the outer peripheral surface of the mold convex portion 10b) is formed as a divergent inclined surface 3b1 (inclined surface 10b1) that expands outward as it goes outward from the cavity CA (FIG. 11, FIG. 11). 14 and 10). By forming the outer peripheral surface of the mold convex portion 10b on the inclined surface 10b1 (and the inner peripheral surface of the concave portion 3b on the inclined surface 3b1), when the blow molds 10 and 10 are opened, the pot 1 ( The bottom wall portion 3 (particularly the concave portion 3b) of the blow molded body BB) can be elastically deformed, and the mold can be opened with good releasability without causing an undercut.

  In addition to the cylindrical surface as shown in FIGS. 11 to 13, the outer peripheral surface of the protrusion 8 may be a tapered surface 8a that is smaller on the opening side than the bottom side of the recess 3b as shown in FIG. . Or it can also be set as the taper surface (not shown) which becomes larger by the opening side rather than the bottom side of the recessed part 3b. In addition, about the thin groove | channel 3e formed in the convex part 3d of the bottom wall part inner surface 3c, it is the same as that of Example 1 (refer FIG. 6).

  In Example 2 (FIGS. 11 to 16), parts having the same functions as those in Example 1 (FIGS. 1 to 10) are denoted by the same reference numerals, and detailed description thereof is omitted. In addition, these embodiments can be appropriately combined and implemented within a range that does not cause technical contradiction. Furthermore, it is possible to carry out each item described in the claims independently.

1 Nursery pot (plant culture pot)
2 peripheral wall portion 2a opening 3 bottom wall portion 3a outer surface 3b concave portion 3b1 inclined surface 3c inner surface 3d convex portion 4 rib (parison remaining portion; intermediate portion)
5 Space 8 Protrusion (Parison remaining part; middle part)
8a Tapered surface 10 Blow mold 10a Notch 10b Mold convex part (convex part)
10b1 inclined surface 10c concave portion (recessed portion)
PR Parison PC1 Tubular connection (Parison connection)
PC2 Plate connection (Parison connection)
BB blow molded product PL parting line

Claims (4)

Made of a synthetic resin that is thinly formed by blow molding, has a peripheral wall portion that expands upward and opens, and a bottom wall portion that closes its lower end side, and a plurality of pieces can be stacked vertically. A plant culture pot,
On the outer surface of the bottom wall portion, two adjacent concave portions that are convex inward are formed, and a partition wall-shaped intermediate having a height in the depth direction of the concave portion between the two concave portions. Part exists,
On the other hand, on the inner surface of the bottom wall portion, one convex portion corresponding to the two concave portions and integrated is formed,
The intermediate portion existing between the two concave portions is formed on the inner surface of the bottom wall portion located below the concave portion of the outer surface of the upper bottom wall portion when a plurality of the pots are overlapped. A plant culture pot characterized in that a space can be formed between the upper bottom wall portion and the lower bottom wall portion by preventing the protrusion from fitting. Made of a synthetic resin that is thinly formed by blow molding, has a peripheral wall portion that expands upward and opens, and a bottom wall portion that closes its lower end side, and a plurality of pieces can be stacked vertically. A plant culture pot,
On the outer surface of the bottom wall portion, a concave portion that is convex inward is formed, and there is a columnar intermediate portion having a height in the depth direction of the concave portion in the concave portion,
On the other hand, a convex portion corresponding to the concave portion and not corresponding to the intermediate portion is formed on the inner surface of the bottom wall portion,
The intermediate portion present in the concave portion is the convex portion on the inner surface of the bottom wall portion located below the concave portion on the outer surface of the bottom wall portion located on the upper side when a plurality of the pots are overlapped. The plant culture pot is characterized in that a space can be formed between the upper bottom wall portion and the lower bottom wall portion by preventing the fitting of the water. Made of a synthetic resin that is thinly formed by blow molding, has a peripheral wall portion that expands upward and opens, and a bottom wall portion that closes its lower end side, and a plurality of pieces can be stacked vertically. A method for producing a plant culture pot,
The mold surface for molding the bottom wall of the pot for blow molding has two convex portions adjacent to each other, and the two convex shapes are transferred to the resin at the time of blow molding, and between the two convex portions By filling the gap with resin, two concave portions are formed on the outer surface of the bottom wall portion of the pot with a partition wall-shaped intermediate portion in between,
On the other hand, an integrated convex portion is formed on the inner surface of the bottom wall portion of the pot by corresponding to the two concave portions and filling all or part of the gap between the two convex portions with resin. A method for producing a plant culture pot. Made of a synthetic resin that is thinly formed by blow molding, has a peripheral wall portion that expands upward and opens, and a bottom wall portion that closes its lower end side, and a plurality of pieces can be stacked vertically. A method for producing a plant culture pot,
The mold surface for molding the bottom wall portion of the pot for blow molding has a convex portion and a hole-shaped concave portion formed in the convex portion, and the convex shape is transferred to the resin at the time of blow molding By filling the concave portion with resin, a concave portion that protrudes inward and a columnar intermediate portion located in the concave portion are formed on the outer surface of the bottom wall portion of the pot,
On the other hand, on the inner surface of the bottom wall portion of the pot, a convex portion corresponding to the convex portion of the mold surface and not corresponding to the concave portion of the mold surface is formed.

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